{"title":"内布拉斯加州麦康纳湖白鲈鱼和杂交条纹鲈鱼的种群特征","authors":"B. J. Schall, C. Schoenebeck, K. Koupal","doi":"10.32873/unl.dc.tnas.39.1","DOIUrl":null,"url":null,"abstract":"White Bass (Morone chrysops) and Hybrid Striped Bass (M. saxatillis × M. chrysops) populations often coexist in the same waterbody and are known to achieve different lengths, have differing reproductive success, and provide different opportunities for anglers. However, comparative population dynamics from systems where Moronids are managed with the same regulation is often lacking. This study aimed to assess the recruitment, mortality, and growth of these species from seasonal samples collected at Lake McConaughy in 2015 and fall 2016. White Bass demonstrated highly variable recruitment in Lake McConaughy despite stocking efforts (mean recruitment variability index = 0.157). Hybrid Striped Bass year class strength was also variable, but RVI was not calculated as the number of missing year classes exceed the number of present year classes. Total annual mortality estimates for Hybrid Striped Bass (39.7%) and White Bass (41.4%) were consistent with values reported in other populations, but both species were observed to achieve uncommon longevity. Both species exhibited sexual size dimorphism, and growth was moderate and consistent with average values presented for North American populations. This study provides insight into the population dynamics of two species with trophy potential managed by the same regulation in Lake McConaughy. Differences in growth patterns indicate the current regulation affects each species differently, and managers may be able to utilize this to inform decisions about management of coexisting Moronid populations.","PeriodicalId":91981,"journal":{"name":"Transactions of the Nebraska Academy of Sciences and affiliated societies","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Population Characteristics of Co-Managed White Bass and Hybrid Striped Bass in Lake McConaughy, Nebraska\",\"authors\":\"B. J. Schall, C. Schoenebeck, K. 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Total annual mortality estimates for Hybrid Striped Bass (39.7%) and White Bass (41.4%) were consistent with values reported in other populations, but both species were observed to achieve uncommon longevity. Both species exhibited sexual size dimorphism, and growth was moderate and consistent with average values presented for North American populations. This study provides insight into the population dynamics of two species with trophy potential managed by the same regulation in Lake McConaughy. Differences in growth patterns indicate the current regulation affects each species differently, and managers may be able to utilize this to inform decisions about management of coexisting Moronid populations.\",\"PeriodicalId\":91981,\"journal\":{\"name\":\"Transactions of the Nebraska Academy of Sciences and affiliated societies\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2019-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Transactions of the Nebraska Academy of Sciences and affiliated societies\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.32873/unl.dc.tnas.39.1\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Transactions of the Nebraska Academy of Sciences and affiliated societies","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.32873/unl.dc.tnas.39.1","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
摘要
白鲈鱼(Morone chrysops)和杂交条纹鲈鱼(M. saxatillis × M. chrysops)经常在同一水域共存,已知它们的长度不同,繁殖成功率不同,为垂钓者提供了不同的机会。然而,往往缺乏来自Moronids以相同规则管理的系统的比较人口动态。本研究旨在评估2015年和2016年秋季在麦康纳湖收集的季节性样本中这些物种的招募、死亡率和生长情况。尽管放养努力,白鲈鱼在McConaughy湖的捕捞表现出高度可变(平均捕捞变异性指数= 0.157)。杂交条纹鲈鱼的班级强度也有变化,但由于缺失班级的数量超过了当前班级的数量,因此没有计算RVI。杂交条纹鲈鱼(39.7%)和白鲈鱼(41.4%)的年总死亡率与其他种群的报告值一致,但观察到这两个物种的寿命都不寻常。这两个物种都表现出性别大小的二态性,生长适中,与北美种群的平均值一致。本研究对麦康纳湖两种具有狩猎潜力的物种的种群动态进行了深入研究。生长模式的差异表明当前的法规对每个物种的影响不同,管理者可以利用这一点来决定如何管理共存的Moronid种群。
Population Characteristics of Co-Managed White Bass and Hybrid Striped Bass in Lake McConaughy, Nebraska
White Bass (Morone chrysops) and Hybrid Striped Bass (M. saxatillis × M. chrysops) populations often coexist in the same waterbody and are known to achieve different lengths, have differing reproductive success, and provide different opportunities for anglers. However, comparative population dynamics from systems where Moronids are managed with the same regulation is often lacking. This study aimed to assess the recruitment, mortality, and growth of these species from seasonal samples collected at Lake McConaughy in 2015 and fall 2016. White Bass demonstrated highly variable recruitment in Lake McConaughy despite stocking efforts (mean recruitment variability index = 0.157). Hybrid Striped Bass year class strength was also variable, but RVI was not calculated as the number of missing year classes exceed the number of present year classes. Total annual mortality estimates for Hybrid Striped Bass (39.7%) and White Bass (41.4%) were consistent with values reported in other populations, but both species were observed to achieve uncommon longevity. Both species exhibited sexual size dimorphism, and growth was moderate and consistent with average values presented for North American populations. This study provides insight into the population dynamics of two species with trophy potential managed by the same regulation in Lake McConaughy. Differences in growth patterns indicate the current regulation affects each species differently, and managers may be able to utilize this to inform decisions about management of coexisting Moronid populations.